1366 - Incorrect integer value: '' for column 'customer_id' at row 1

insert into whos_online (customer_id, full_name, session_id, ip_address, time_entry, time_last_click, last_page_url) values ('', 'Guest', '9hlfk31l7vt06t6nok3r30i8g1', '54.161.100.24', '1539667606', '1539667606', '/catalog/shopping_cart.php?osCsid=36lgingo681bnmr8oq3pdbvpi1')

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